I don't see how anyone could survive out in space without a full bodysuit.
Putting aside the effects (of lack of) on your lungs, the extreme cold of space would freeze any moisture on your body relatively quickly. Your skin, muscles, and internal organs would loose all body heat and the moisture would start to crystalize, and that's the kind of extensive/culmative damage that no Doctor on Earth right now can 100% correct/repair; otherwise cryogenics would be a much more valuable tool than it is right now.
I cringe at the effect exposure to space would do to your eyeballs
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Unless the human body can be genetically enhanced to survive in space for short durations, I think we'll always need 100% coverage to work/survive in space.